Yes you can either take the 12v charger +ve direct to the battery or via a busbar. The battery should have a proper
MRBF fuse and then an
Isolator switch before any connection to protect the whole system and so you can isolate it. Both of these should be proper BlueSea not cheap Bolatis or whatever shit from amazon or the CFM fuses fogstar sell. All +ve cables should be appropriately fused to protect the cable in addition to the main battery fuse. Common to use the
Mega - Midi fuse boxes as this combines both busbar and fuses neatly.
If not already done so it would...